CN103498827A

CN103498827A - Hydraulic system

Info

Publication number: CN103498827A
Application number: CN201310361678.8A
Authority: CN
Inventors: 戴格瑞·理查德
Original assignee: White Drive Products Inc
Current assignee: Danfoss Power Solutions US Co
Priority date: 2008-06-05
Filing date: 2009-06-05
Publication date: 2014-01-08
Anticipated expiration: 2029-06-05
Also published as: US20090317277A1; CN103498827B; US8257068B2; CN101598155A; CN101598155B; US8647087B2; US20120285155A1

Abstract

The present invention relates to a hydraulic motor having a cooling system. The hydraulic motor includes a stator, a rotor that rotates and orbits in the stator, a drive link connected to the rotor, and a housing connected with the stator. The housing includes a working fluid inlet port, a working fluid outlet port, a cooling fluid inlet port, and a cooling fluid outlet port. Each port extends through the housing and is configured to connect with a different associated external fluid line. Pressurized fluid enters the working fluid inlet port to rotate and orbit the rotor en route to the working fluid outlet port. The cooling fluid ports are isolated from the working fluid inlet port and the working fluid outlet port within the housing.

Description

Hydraulic system

The application is to be dividing an application of on June 5th, 2009, denomination of invention No. 200910146979.2 patent application that be " cooling system of gerotor motor " the applying date.

The mutual reference of related application

The application requires the U.S. Provisional Application No.61/059 submitted on June 5th, 2008, the U. S. application No.12/474 that on May 29th, 064 and 2009 submits to, and 339 preference, be incorporated herein their full content as a reference.

Technical field

The present invention relates to a kind of for promoting the hydraulic system of vehicle.More specifically, the present invention relates to a kind of hydraulic system that comprises gerotor motor.

Background technique

For advancing the hydraulic system of riding type lawnmower and other dillies to comprise the pump be connected with oil hydraulic motor.Pump is for for example, being transported to oil hydraulic motor by pressure fluid (oil).The oil hydraulic motor transformation of energy of the compressed oil stream of self-pumping in the future becomes for transferring rotational motion to advance moment of torsion and the speed of riding type lawnmower.Due to the oil hydraulic motor continuous firing, the frictional force that the motor moving element produces may cause operating temperature high.Cooling motor can improve the life-span of motor and increase work efficiency.

Well-known in hydraulic system, import cold oil to drive the output shaft of oil hydraulic motor under pressure.In a kind of such known hydraulic, cold oil is imported into motor, more specifically is imported into the geroter set in gerotor motor.Oil exits from motor by the drain tap of motor.Oil hydraulic motor also can be manufactured into the central opening that comprises pressurization, and oil hydraulic motor does not comprise drain tap, makes so this known cooling system be unsuitable for such motor.

Summary of the invention

The invention provides a kind of oil hydraulic motor with cooling system that can overcome above-mentioned shortcoming, described oil hydraulic motor comprises stator, in described stator, rotate and around rotor, the drive link be connected with described rotor and the housing be connected with described stator.Described housing comprises that working fluid entry port, working fluid exit port, cooling fluid entry port and cooling fluid and exit port.Each port extends through described housing and is configured to and connects from different associated external fluid pipe-lines.The fluid of pressurization enter described working fluid entry port with in arriving described working fluid and exit the way of port, described rotor is rotated and around.Described cooling fluid port exits port isolation with described working fluid entry port and described working fluid in described housing.

An example that can overcome the hydraulic system of above-mentioned shortcoming comprises that oil hydraulic motor, pump, the described pump of connection and described oil hydraulic motor are with for driving and fluid pipe-line and the oil cooler be connected with at least one described fluid pipe-line for cooling described motor.Described motor comprises: housing section comprises that working fluid entry port and working fluid exit port; With the geroter set that described housing section is connected, comprise rotor and stator; The drive link be connected with described rotor; The output shaft be connected with described drive link; Be connected and seal the end plate of described housing section one end with described housing section.When fluid exits between port while flowing through described motor at described working fluid entry port and described working fluid, described rotor in described stator, rotate and around.Described end plate comprises that cooling fluid entry port, cooling fluid exit port and be formed on the groove on described end plate internal surface.Described groove exits port isolation with described working fluid entry port and described working fluid in described housing, make when described cooling fluid is flowed through described motor, enter described groove and exit by described cooling fluid the cooling fluid that port exits by described cooling fluid entry port and by described working fluid entry port, do not enter or exit port by described working fluid and exit.

A kind of end plate that can be operated with the gerotor motor of cooling gerotor motor, described end plate comprises: basically flat internal surface, from described internal surface extend into described end plate groove, extend into the cooling fluid entry port of described end plate and exit port from the cooling fluid that the outer surface of described end plate extends into described end plate from the outer surface of described end plate.Described flat internal surface basically is configured to contact the plane of the parts of relevant gerotor motor.When described end plate connects to described relevant gerotor motor, the outer surface of described end plate contacts with external environment.Described cooling fluid entry port is communicated with described concentrated flow body.Described cooling fluid exits port and also is communicated with described concentrated flow body.

An example that reduces the unbalanced oil hydraulic motor of gerotor device internal pressure comprises: housing section comprises entry port, exits port and central opening; The stator be connected with described housing section; When the fluid of pressurization in described stator, rotate while being imported into described entry port and around rotor; The drive link be connected with described rotor; Be connected with described drive link and be configured in the output shaft in described central opening; The end plate be connected with described housing section; Balance plate; And be limited in the ball between described balance plate and described end plate.Described rotor is included in front valve pool, the rear water jacket on the rear side of described rotor, the rear inside groove on the rear side of described rotor on the front side of described rotor and is connected described rear water jacket and described front valve pool through the passage of described rotor.Described balance plate contacts the rear side of described rotor.Described balance plate is configured between described rotor and described end plate.Described balance plate comprises the shuttle chamber that extends internally from the first plane of described plate, from the second plane of described plate, extend internally into the external chennel in described shuttle chamber, from the second plane of described plate, extend internally into the outer seat of the internal channel in described shuttle chamber, contiguous described external chennel and the interior valve seat of contiguous described internal channel.When described rotor, in described stator, rotate and around the time, the inswept described balance plate of the rear water jacket of described rotor, make the described external chennel in described balance plate be connected with described epitrochanterian described rear water jacket, and described epitrochanterian described rear inside groove keep being communicated with the fluid of described central opening.

The accompanying drawing explanation

Fig. 1 schematically shows a kind of hydraulic system, and it comprises the fluid pipe-line of pump, oil hydraulic motor, oil cooler and connection pump and oil hydraulic motor.

Fig. 2 is the sectional view of the oil hydraulic motor shown in Fig. 1.

Fig. 3 is the planimetric map (outside) of the end plate of the motor shown in Fig. 1.

Fig. 4 is the sectional view along the line 4-4 of Fig. 3.

Fig. 5 is the planimetric map (inboard) of the end plate shown in Fig. 3.

Fig. 6 is the enlarged view of Fig. 4 part.

Fig. 7 is the planimetric map (rotor set side) of the balance plate of the motor shown in Fig. 1.

Fig. 8 is the sectional view along the line 8-8 of Fig. 7.

Fig. 9 is the planimetric map (end plate side) of the balance plate shown in Fig. 7.

Embodiment

Fig. 1 schematically shows can be for advancing the hydraulic system of riding type lawnmower.Hydraulic system in Fig. 1 can be for advancing other small-scale terrestrial vehicles.This hydraulic system comprises oil hydraulic motor 10 and the pump 12 be connected with this oil hydraulic motor via fluid pipe-line.This fluid pipe-line connects pump 12 and oil hydraulic motor 10 with for driving and for cooling motor.This hydraulic system also comprises oil cooler 14 (for example radiator) and reservoir 16.In Fig. 1, for the pump 12 of propulsion motor and the connection between motor 10, be closed-loop path, it may cause the operating temperature of motor 10 high.When motor 10 especially this situation when driving the wheel of lawnmower.Therefore, be desirable to provide a kind of cooling system for the cooling liquid pressure motor.

The pump 12 of hydraulic system is the pump of general type, and it comprises main pump 20 and service pump 22.Main pump 20 is variable-displacement pumps, and the service pump shown in Fig. 1 can be the supply pump used together with variable-displacement pump.Variable-displacement pump 20 in the embodiment shown in fig. 1 and supply pump 22 drive by input shaft 24, and this input shaft is connected with the motor (not shown) of lawnmower.These pumps 20 and 22 are conventional, therefore do not need to further illustrate.

Fluid pipe-line shown in Fig. 1 can comprise working fluid pipeline and cooling fluid pipeline.The first working fluid pipeline 30 connects the working fluid entry port 34 (being covered by nut in Fig. 1) of main pump outlet 32 (schematically showing) and motor 10.The second working fluid pipeline 36 connects main pump import 38 (schematically showing) and exits port 42 (being covered by nut) with the working fluid of oil hydraulic motor 10 in Fig. 1.Main pump 20, working fluid pipeline 30 and 36 and motor 10 define the high closed-loop path of operating temperature that may cause motor.Other elements, for example filter, can be arranged in the loop that connects main pump 20 and motor 10.

Fluid pipe-line shown in Fig. 1 also comprises the first cooling fluid pipeline 50 that connects service pump outlet 52 (schematically showing) and cooling fluid entry port 54.The second cooling fluid pipeline 56 connects service pump import 58 (schematically showing) and exits port 62 with cooling fluid.Oil cooler 14 is connected with at least one cooling fluid pipeline.As shown in Figure 1, in the embodiment shown, oil cooler 14 is connected with the second cooling fluid pipeline 56 that exits port 62 for being connected service pump import 58 and cooling fluid.

From Fig. 1, obviously can find out, the fluid of propulsion motor 10, working fluid, open (except being delivered to a small amount of fluid of variable-displacement pump 20 by supply pump 22) with the fluid isolation of cooling motor.In motor self, the fluid of propulsion motor 10 and the fluid isolation of cooling motor are opened.In other words, the fluid that enters motor 10 by cooling fluid entry port 54 motor of flowing through does not exit by the working fluid outlet 42 of motor.On the contrary, the fluid entered by cooling fluid entry port 54 exits port 62 by cooling fluid and exits, and with the fluid of motor with propulsion motor of flowing through, does not mix.The inner member of motor is shown in more detail in Fig. 2.In the another kind configuration, on working fluid pipeline 30,36, accessory can be set.The first cooling fluid pipeline 50 can be connected with cooling fluid entry port 54 with the first working fluid pipeline 30, rather than connects service pump outlet 52 and cooling fluid entry port 54.Equally, the second cooling fluid pipeline 56 can exit port 62 with the second working fluid pipeline 36 and cooling fluid and is connected.In this case, service pump 22 can be set.

With reference to Fig. 2, oil hydraulic motor 10 comprises housing, and this housing comprises fore shell body 70 and the end plate 72 be connected with this fore shell body.This housing defines in Fig. 1 visible working fluid entry port 34, working fluid and exits port 42, cooling fluid entry port 54 and cooling fluid and exit port 62.For illustrated embodiment more particularly, working fluid entry port 34 and working fluid exit port 42 and are formed in fore shell body 70, and cooling fluid entry port 54 and cooling fluid exit port 62 and be formed in end plate 72.Each

port

34,42,54 and 62 extends through housing, and is configured to connect from different external fluid pipelines.

Oil hydraulic motor 10 also comprises the geroter set 74 be connected with end plate 72 with fore shell body 70.This geroter set comprises rotor 76 and stator 78.Rotor 76 the interior rotation of stator 78 and around.Stator 78 is connected with housing.

In the embodiment shown in Fig. 2, rotor 76 is included in valve pool 82 before the annular on the frontal plane 80 of the contiguous manifold 84 of rotor.Front valve pool 82 is connected with water jacket 86 after annular on the back plane 90 that is arranged on the contiguous balance plates 88 of rotor 76 via passage 92 (schematically showing).Rear inside groove 94 (being also annular) from radially inwardly configuration of water jacket 86, and be formed on the same rear surface 90 of rotor 76.The function of these grooves and passage is described in more detail below.

Continuation is with reference to Fig. 2, and a plurality of bolts 100 (only seeing in Fig. 2) are connected end plate 72, balance plate 88, geroter set 74 and manifold 84 with fore shell body 70.Fore shell body 70 comprises central opening 102, and in the illustrated embodiment, central opening 102 exits port 42 with working fluid entry port 34 or working fluid and is connected.Drive link 104 is connected with rotor 76 and is configured in the central opening 102 of fore shell body 70.Output shaft 106 is connected with drive link 104 and is configured at least in part in central opening 102.Output shaft 106 shown in Fig. 2 is connected with brake assemblies 108, also can be connected with the wheel (not shown) of lawnmower.In the operating process of oil hydraulic motor 10, the central opening 102 of fore shell body 70 may be under pressure, thereby make the motor 10 shown in Fig. 2 be unsuitable for drain tap.Therefore, be provided for the another kind mechanism of cooling motor 10.

With reference to Fig. 3-6, end plate 72 comprises

cooling fluid port

54 and 62, and each port is with inner plane 114 milling end plate 72, turning or machining near balance plate 88 and the annular cooling bath 112 formed is communicated with (referring to Fig. 2).Cooling fluid entry port 54 and cooling fluid exit port 62 and extend into end plate 72 from the outer surface 110 of end plate.When end plate 72 is connected with the remaining part of motor 10, outer surface 110 contacts with external environment.In Fig. 5, with respect to end plate 72 and Cao112 center, from port 54, measure along clockwise direction,

cooling fluid port

54 and 62 is setovered about 160 ° at an angle to each other.In other words, cooling fluid entry port 54 and cooling fluid exit port 62 around circular groove 112 intervals at least about 160 °.The interval of two-port has avoided the cooling circuit shown in Fig. 1 short circuit to occur.It is nearer that

cooling fluid port

54 and 62 can arrange each other; Yet, in such configuration, may need to block the circular groove 112 between the nearest path between two-port, to prevent the cooling fluid short circuit.For example, the wall 116 be presented in groove 112 exits flowing along a direction between port 62 for blocking-up at cooling fluid entry port 54 and cooling fluid.

Annular external sealed recess 120 is from annular cooling bath 112 radially outward biasings.Annular external sealed recess 120 is accommodated Sealing 122 (Fig. 2), so that cooling bath 112 and external environment are isolated.In annular, seal recess 124 radially inwardly configures from cooling bath 112, and accommodates Sealing 126 (Fig. 2), so that by cooling bath 112, with flowing through motor 10, the working fluid of driver output axle 106 is isolated (Fig. 2).In other words, each Sealing is by the cooling fluid in motor and working

fluid isolation.Sealing

122 and 126 is also isolated the rotatable parts of the fluid in cooling bath 112 and oil hydraulic motor.In other words, groove 112 exits port 42 isolation with working fluid entry port 34 and working fluid in motor casing, make the fluid that enters groove 112 by cooling fluid entry port 54 not enter by working fluid entry port 34, also by working fluid, do not exit port 42 and exit.

In annular, seal recess 124 is less than the known seal recess for Seal end plate and balance plate.Because the area of interior seal recess 124 is less, can reduce to act on the power on end plate 72 and balance plate 88.Improved like this moment of torsion ability to work of output shaft 106, because mechanical resistance reduces.In addition, do not resemble during motor 10 work the motor with larger this recess hot.In the illustrated embodiment, the width that in annular, seal recess 124 is radially measured is approximately 0.120 inch, and the degree of depth of measuring vertically is approximately 0.058 inch.

Referring again to Fig. 1, the cooling circuit that comprises supply pump 22 and the cooling fluid pipeline 50 that is connected supply pump and

end plate

72 and 56 is the cooling liquid pressure motor by the end plate that cold oil is imported to oil hydraulic motor.As shown in Figure 2, the contiguous geroter set 74 of end plate 72 and balance plates 88, they are the heating part of motor 10 normally.Oil is drawn into cooling fluid entry port 54 and flows into cooling bath 112.Oil exits port 62 from cooling fluid and exits, and passes through radiator 14 on the way, to return at oil, enters cold oil before supply pump 22.This differs widely with the known oil hydraulic motor cooling system that drives hydraulic motor output shaft with importing cold oil under pressure.In known oil hydraulic motor cooling system, cold oil is imported into motor, and exits from motor by the drain tap of motor.Because the motor 10 shown in Fig. 1 and Fig. 2 has the central opening of pressurization, so it does not comprise drain tap, makes so known cooling system be unsuitable for this motor.Yet cooling system disclosed by the invention also can be worked together with the oil hydraulic motor that comprises drain tap.

Loop shown in Fig. 1 will for the oil of cooling motor with for the oil content of drive motor, open.Cooling channel 112 is presented in end plate 72.The housing of motor 10, especially motor, can comprise and be limited in housing and the cooling channel be communicated with the cooling fluid port.For example, the cooling channel similar to cooling channel 112 can be formed in the miscellaneous part of motor, as balance plate 88, stator 78, manifold 84 etc.

Fig. 7-9 illustrate the balance plate 88 of oil hydraulic motor 10.The shuttle chamber 130 that the back plane 132 that balance plate 88 comprises slave plate 88 axially extends internally towards the frontal plane 134 of plate.External chennel 136 internal surface 134 in the past extends internally into shuttle chamber 130.Internal channel 138 also extends internally into shuttle chamber 130 from front surface 134.Outer seat 142 is formed in chamber 130 and contiguous external chennel 136.Interior valve seat 144 also is formed in chamber 130 and contiguous internal channel 138.Referring again to Fig. 2, check ball 150 is arranged in shuttle chamber 130, and is limited between balance plate 88 and end plate 72.

When rotor 76 the interior rotation of stator 78 and around the time, the inswept balance plate 88 of the annular water jacket 86 on rotor 76, make the external chennel 136 in balance plate 88 be connected with the annular water jacket 86 on rotor 76.The fluid be formed between the central opening 102 of central opening that internal channel in balance plate 88 138 keeps rotors 76 and fore shell body 70 is communicated with.Therefore, when the central opening of rotor 76, in high pressure relatively lower time, ball 150 pushed away from valve seat 144 (Fig. 8), and is directed to valve seat 142.When the central opening of rotor, during as the outlet of motor (relatively low pressure), ball 150 is positioned on valve seat 144.

The above understands oil hydraulic motor and hydraulic motor system in detail.After reading and understanding above-mentioned detailed description, can modify and change it.The present invention is not limited only to above-described embodiment.On the contrary, the present invention is broadly limited by appended claims and its equivalent.

Claims

1. a hydraulic system comprises:

Oil hydraulic motor, comprise

Housing section, comprise that working fluid entry port and working fluid exit port;

With the geroter set that described housing section is connected, comprise rotor and stator, when fluid exits between port while flowing through described motor at described working fluid entry port and described working fluid, described rotor in described stator, rotate and around;

The drive link be connected with described rotor;

The output shaft be connected with described drive link; With

Be connected and seal the end plate of described housing section one end with described housing section, described end plate comprises the cooling fluid entry port, cooling fluid exits port and is formed on the groove on described end plate internal surface, described groove exits port isolation with described working fluid entry port and described working fluid in described housing, make when described cooling fluid is flowed through described motor, enter described groove and exit by described cooling fluid the cooling fluid that port exits by described cooling fluid entry port and by described working fluid entry port, do not enter or exit port by described working fluid and exit,

Pump, comprise pump inlet and pump discharge;

Fluid pipe-line, connect described pump and described oil hydraulic motor with for driving and for cooling described oil hydraulic motor; With

The oil cooler be connected with at least one described fluid pipe-line.

2. hydraulic system as claimed in claim 1, the position of wherein said oil cooler makes to be exited by described cooling fluid the fluid that port leaves described oil hydraulic motor and flows through described oil cooler.

3. hydraulic system as claimed in claim 1, wherein said pump comprises main pump and service pump, and described main pump comprises main pump import and main pump outlet, and described service pump comprises service pump import and service pump outlet.

4. hydraulic system as claimed in claim 3, wherein said fluid pipe-line comprises the first working fluid pipeline of connecting described main pump outlet and described working fluid entry port, be connected the second working fluid pipeline that described main pump import and described working fluid exit port, and they limit closed-loop path together.

5. hydraulic system as claimed in claim 4, wherein said fluid pipe-line comprises the first cooling fluid pipeline of connecting described service pump outlet and described cooling fluid entry port and the second cooling fluid pipeline that is connected described service pump import and described cooling fluid and exits port, and wherein said oil cooler is connected with at least one described cooling fluid pipeline.

6. hydraulic system as claimed in claim 5, wherein said service pump is arranged on described main pump, and fluid is supplied to described main pump from reservoir.